1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* PLT trampolines. s390 version.
Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* This code is used in dl-runtime.c to call the `fixup' function
and then redirect to the address it returns. */
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
* with the following linkage:
* r2 - r6 : parameter registers
* f0, f2 : floating point parameter registers
* 24(r15), 28(r15) : PLT arguments PLT1, PLT2
* 96(r15) : additional stack parameters
* The normal clobber rules for function calls apply:
* r0 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
* f4, f6 : call saved
* f0 - f3, f5, f7 - f15 : call clobbered
*/
#include <sysdep.h>
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
cfi_startproc
.align 16
_dl_runtime_resolve:
stm %r2,%r5,32(%r15) # save registers
st %r14,8(%r15)
cfi_offset (r14, -88)
lr %r0,%r15 # create stack frame
ahi %r15,-96
cfi_adjust_cfa_offset (96)
st 0,0(%r15)
lm %r2,%r3,120(%r15) # load args saved by PLT
basr %r1,0
0: l %r14,1f-0b(%r1)
bas %r14,0(%r14,%r1) # call resolver
lr %r1,%r2 # function addr returned in r2
ahi %r15,96 # remove stack frame
cfi_adjust_cfa_offset (-96)
l %r14,8(15) # restore registers
lm %r2,%r5,32(%r15)
br %r1
1: .long _dl_fixup - 0b
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
cfi_startproc
.align 16
_dl_runtime_profile:
stm %r2,%r6,32(%r15) # save registers
std %f0,56(%r15)
std %f2,64(%r15)
st %r6,8(%r15)
st %r12,12(%r15)
st %r14,16(%r15)
cfi_offset (r6, -64)
cfi_offset (f0, -40)
cfi_offset (f2, -32)
cfi_offset (r12, -84)
cfi_offset (r14, -80)
lr %r12,%r15 # create stack frame
cfi_def_cfa_register (12)
ahi %r15,-96
st %r12,0(%r15)
lm %r2,%r3,24(%r12) # load arguments saved by PLT
lr %r4,%r14 # return address as third parameter
basr %r1,0
0: l %r14,6f-0b(%r1)
la %r5,32(%r12) # pointer to struct La_s390_32_regs
la %r6,20(%r12) # long int * framesize
bas %r14,0(%r14,%r1) # call resolver
lr %r1,%r2 # function addr returned in r2
icm %r0,15,20(%r12) # load & test framesize
jnm 2f
lm %r2,%r6,32(%r12)
ld %f0,56(%r12)
ld %f2,64(%r12)
basr %r14,%r1 # call resolved function
1: lr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
l %r14,16(%r15) # restore registers
l %r12,12(%r15)
l %r6,8(%r15)
br %r14
cfi_def_cfa_register (12)
2: jz 4f # framesize == 0 ?
ahi %r0,7 # align framesize to 8
lhi %r2,-8
nr %r0,%r2
slr %r15,%r0 # make room for framesize bytes
st %r12,0(%r15)
la %r2,96(%r15)
la %r3,96(%r12)
srl %r0,3
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
la %r2,8(%r2)
la %r3,8(%r3)
brct %r0,3b
4: lm %r2,%r6,32(%r12) # load register parameters
ld %f0,56(%r12)
ld %f2,64(%r12)
basr %r14,%r1 # call resolved function
stm %r2,%r3,72(%r12)
std %f0,80(%r12)
lm %r2,%r3,24(%r12) # load arguments saved by PLT
basr %r1,0
5: l %r14,7f-5b(%r1)
la %r4,32(%r12) # pointer to struct La_s390_32_regs
la %r5,72(%r12) # pointer to struct La_s390_32_retval
basr %r14,%r1 # call _dl_call_pltexit
j 1b
6: .long _dl_profile_fixup - 0b
7: .long _dl_call_pltexit - 5b
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#endif
|
